Merge pull request #1 from timjgleeson/master

Add framework for testing stylus mixins
Renaming module
Removing tests from master branch

Waiting on more solid implementation / code coverage
and resolving a reliance on an outdated test runner module.
Renaming mixins folder and index stylesheet
Setup of bundle to be used as Stylus plugin
Restructuring to allow for future tests directory
Updating info in package.json
Fixing incorrect path
Minor changes to mixins based on tests
Adding tests for all mixins
Bumping version and adding travis config
Adding Travis CI build status image
Adding .npmignore
Merge branch 'master' of github.com:jackbrewer/stylus-mixins
Bumping version number
Fixing typo in test description
Simplifying width/height mixins and improving tests
Refactoring grid mixin and writing (incomplete) tests
Updating README
Bumping version number